package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmaelDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmaelDishMapper setmaelDishMapper;

    /**
     * 新增菜品和相应的口味
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {


        Dish dish = new Dish();
        //对象的属性拷贝
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表添加一条数据
        dishMapper.insert(dish);
        //获取insert语句所生成的主键值，需要开启主键返回并且KeyProperties绑定到id上
        Long dishId = dish.getId();


        //向菜品表添加N条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //可以直接批量插入到数据库中，而不需要把对象都遍历出来再插入
            flavors.forEach(dishFlavor -> {
                //需要遍历设置id值
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        long total = page.getTotal();
        List<DishVO> result = page.getResult();
        return new PageResult(total, result);
    }

    /**
     * 菜品的批量删除
     *
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能被删除，是不是启售状态下的菜品？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //启售中，不允许删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能被删除，是否被套餐关联了？
        List<Long> setmealIds = setmaelDishMapper.getSetmaelIdByDishId(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //说明当前菜品被套餐关联，不允许删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //如果可以删除，就需要删除菜品表中的数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //还需要删除相应的菜品口味表中的数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //sql: delete from dish where id in (?,?,?,?)
        //根据菜品id批量删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);

        //sql: delete from dish_flavor where dish_id in (?,?,?,?)
        //根据菜品id批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查到的数据封装到dishVO当中
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品及其口味信息
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品的基础信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.update(dish);


        //口味的处理会是先删除原有的口味数据再插入口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .status(StatusConstant.ENABLE)
                .categoryId(categoryId)
                .build();
        List<Dish> dishList = dishMapper.list(dish);
        return dishList;
    }

    /**
     * 菜品的启售停售
     * @param status
     * @param id
     */
    @Transactional
    @Override
    public void startOrStop(Integer status, Long id) {
        //设置菜品的基本属性
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        //更新菜品的基本属性
        dishMapper.update(dish);

        if (dish.getStatus() == StatusConstant.DISABLE) {
            //如果是停售操作，还需要将包含当前菜品的套餐也一并停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            //select setmeal_id from setmeal_dish where dish_id in (?,?,?,?)
            List<Long> setmealDishIds = setmaelDishMapper.getSetmaelIdByDishId(dishIds);
            if (setmealDishIds != null && setmealDishIds.size() > 0) {
                for (Long setmealDishId : setmealDishIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealDishId)
                            .status(StatusConstant.ENABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }



    }

    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询相应的口味数据
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(dishVO.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
